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How to backup and restore Opera settings/extensions/bookmarks etc

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If I have the latest version of Opera, and I do a complete re-install of my entire computer, how can I ensure that I'm able to get most or all of my settings, extensions, bookmarks, etc back when I install Opera again?

As it happens, I have already installed everything anew, and the only thing I have is a backup of the old computer's App Data and Program Files folders. Simply copying all of those files back into the Opera Stable folder doesn't do the trick.

As it happens, I have already installed everything anew, and the only thing I have is a backup of the old computer's App Data and Program Files folders. Simply copying all of those files back into the Opera Stable folder doesn't do the trick.

Under users/username/appdata/roaming/ (may be different depending on Windows version) you may find one or more Opera folders. Copying its data should have brought your data.

I backed up this:
"C:\Users\MyName\AppData\Roaming\Opera Software\Opera Stable"
from the previous computer, and on the current computer I copy/paste all of those files into this computer's
"C:\Users\MyName\AppData\Roaming\Opera Software\Opera Stable"
folder.

However, when I then start Opera, it tells me "Your preferences files are corrupt or invalid. Opera is unable to recover your settings."

Perhaps the fact that I used have Windows 10 and now have Windows 8.1 have something to do with it...?

The most important things to get back would be my bookmarks (even if in non-Opera format) and to be able to see a list of my extensions (so that I can download and install them again). However, the actual names of the extensions are not mentioned in e.g. the Extensions folder (just random-looking numbered folders).

The secret it to delete the C:\Users"Username"\AppData\Roaming\Opera Software folder and copy the new version in C:\Users"Username"\AppData\Roaming\ in its place. That made my Opera 42 on my new computer look and function exactly like my old computer.